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In genetics, a maternal effect occurs when the phenotype of an organism is determined by the genotype of its mother. [1] For example, if a mutation is maternal effect recessive, then a female homozygous for the mutation may appear phenotypically normal, however her offspring will show the mutant phenotype, even if they are heterozygous for the mutation.
In Serer culture, inheritance is both matrilineal and patrilineal. [36] It all depends on the asset being inherited – i.e. whether the asset is a paternal asset – requiring paternal inheritance (kucarla [36]) or a maternal asset – requiring maternal inheritance (den yaay [34] or ƭeen yaay [36]).
Other examples of heritability in evolution that are not under the direct control of genes include the inheritance of cultural traits, group heritability, and symbiogenesis. [ 16 ] [ 17 ] [ 18 ] These examples of heritability that operate above the gene are covered broadly under the title of multilevel or hierarchical selection , which has been ...
Paternal inheritance of a deletion of this region is associated with Prader-Willi syndrome (characterised by hypotonia, obesity, and hypogonadism). Maternal inheritance of the same deletion is associated with Angelman syndrome (characterised by epilepsy, tremors, and a perpetually smiling facial expression).
Recent trends in behavioural genetics have indicated an additional focus toward researching the inheritance of human characteristics typically studied in developmental psychology. For instance, a major focus in developmental psychology has been to characterize the influence of parenting styles on children.
The following list includes societies that have been identified as matrilineal or matrilocal in ethnographic literature. "Matrilineal" means kinship is passed down through the maternal line. [1] The Akans of Ghana, West Africa, are Matrilineal. Akans are the largest ethnic group in Ghana.
Maternal impression, according to a long-discredited medical theory, was a phenomenon that explained the existence of birth defects and congenital disorders. The theory stated that an emotional stimulus experienced by a pregnant woman could influence the development of the fetus .
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